Innovative Construction Technology with High Factory Readiness from the Chuvash Republic

2020 ◽  
pp. 29-35
Author(s):  
V.A. SHEMBAKOV ◽  
Keyword(s):  
High Speed ◽  
Load Capacity ◽  
Precast Concrete ◽  
Construction Materials ◽  
Engineering Industry ◽  
Housing Construction ◽  
Building Structures ◽  
Construction Technology ◽  
Floor Slabs ◽  
Large Panel

The technology that fully meets the modern requirements of the market in the Russian Federation is presented – stand technology of precast-monolithic frame and large-panel housing construction with the use of floor slabs with pre-stressing up to 8 m, both solid and caisson versions on universal stands. This technology, which combines the best solutions of prefabricated, monolithic, panel, brick and other construction technologies, competes with the latest Western developments. The advantages of the proposed technology are as follows: high factory readiness and quality, versatility and architectural expressiveness of building structures (97% of the frame), precast building; energy savings – consumption is three times less compared to existing technologies for the production of reinforced concrete products; material savings (1.5 times less than for monolithic and panel housing construction); high speed of construction (up to 5 ths. m2 of prefabricated monolithic frame per month for one tower crane; lower weight of bearing structures compared to other structures (0.146 m3 of precast concrete per 1 m2 of the total area of the building) and, as a result, lower costs for foundations and the use of mechanisms with a lower load capacity on construction sites; reliable erection without welding; usable area – more than 80% of the total area; free planning solutions; quick adjustment of equipment for the production of products necessary for the market at a given time. The bench technology of precast-monolithic frame and large-panel housing construction with the use of floor slabs with pre-stressing up to 8 m is an example of the implementation of inter-industry cooperation in the construction materials and mechanical engineering industry based on Russian scientific developments and adapted modern foreign technologies. Keywords: innovations, construction technology with high factory readiness, modernization of large-panel housing construction and construction industry plants, industrial housing construction, prefabricated monolithic frame, energy efficiency, construction speed.

Innovative Energy-Saving Sandwich-Panels for Industrial Construction

2020 ◽  
Vol 787 (12) ◽  
pp. 47-51
Author(s):  
V.N. Nikolaev ◽  
◽  
V.F. Stepanova ◽  
A.V. Mikhailova ◽  
◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Sandwich Panel ◽  
Precast Concrete ◽  
Sandwich Panels ◽  
Thermal Characteristics ◽  
Protective Layer ◽  
Housing Construction ◽  
Concrete Wall ◽  
Large Panel ◽  
Leading Position

Today, large-panel housing construction occupies a leading position, both in terms of construction speed and sales, which contributes to an increase in the volume of precast concrete housing construction. Outdated series of large-panel houses do not meet modern requirements. Old faceless panel houses are gradually replaced by beautiful housing complexes with different types of facades. At present, in the technology of construction of panel houses from sandwich-panels, the relevant trend is to reduce the standard thickness of the facade layer of a three-layer sandwich-panel (GOST 31310–2015 “ Three-Layer Reinforced Concrete Wall Panels with Effective Insulation. General Technical Conditions”) from 70 mm to 40 mm or less. Panel houses require a reduction in metal consumption, material consumption and improvement of thermal characteristics. This requires the development and implementation of new materials. The use of such construction products made of composite materials as diagonal flexible composite connections, flexible mounting loops and composite reinforcement mesh will make it possible to reduce the thickness of the protective layer of concrete without compromising the stability of the structure under the influence of the external environment due to the high corrosion resistance of the composite, reduce the weight of the panel, reduce the cost of manufacturing a unit of panel, increase the energy efficiency of the panel, ensure long-term strength of enclosing structures – create an innovative energy-efficient reinforced concrete sandwich panel of the XXI century.

scholarly journals Peningkatan Produktivitas Konstruksi Melalui Pemilihan Metode Konstruksi

2012 ◽  
Vol 8 (1) ◽  
pp. 25
Author(s):  
Paulus Setyo Nugroho
Keyword(s):  
Construction Industry ◽  
High Speed ◽  
Precast Concrete ◽  
Construction Materials ◽  
High Speed Rail ◽  
Modular Systems ◽  
Guaranteed Quality ◽  
Manufacture Industry ◽  
Increase Productivity ◽  
Precast Structures

<p>Productivity growth in the construction is lower than that of in the industry sector. Level of innovation in this sector is too low. Many problems of inefficiency in the construction process are a lotof waste of resources that do not produce value. According to  LCI (Lean ConstructionInstitute) waste in the construction industry is about 57% while the activity that adds value is only 10%. The construction industry has a lot to learn from manufacture industry. Some innovations by applying an appropriate and efficient  methods in the field of construction adopted many of the manufacturing, including modular systems/fabrication (precast concrete). Construction materials are mass produced in acontrolled environment and then assembled inthe site. The use of precast on any project shows that there are advantages obtained are: cheaper, faster/more productive and guaranteed quality. The duration of the Rusunawa (Simple Flats for Rent) Structure construction phase in Cilacap for precast method is 168 days while for the implementation of the conventional method is 196 days. The duration of the construction of precast structures is faster 28 days (14%) faster than that of the conventional structures. In high-speed rail project on the border of Belgium and the Netherlands, use Rheda 2000 NL method, which development of Rheda method, can increase productivity and lower overtime costs as 24.6%. In the residential case, quicklyconstructed building criteria can be categorizedinto several aspects, such as dimensions, weight components and connection systems.The suitable selection criteria will accelerate instalment proses of the wall panel.</p>

scholarly journals Design of low-rise buildings from thin-walled steel frame structures

2018 ◽  
Vol 193 ◽  
pp. 03037 ◽  
Author(s):  
Olga Umnova ◽  
Dmitry Tuev ◽  
Timur Giyasov
Keyword(s):  
Ultimate Load ◽  
Load Capacity ◽  
Steel Structures ◽  
Load Test ◽  
Construction Technology ◽  
Floor Slabs ◽  
Rapid Construction ◽  
Steel Frame Structures ◽  
Thin Walled ◽  
Frame Construction

Addressing sustainable development challenges, Russia is seeking new opportunities for the use of thin-walled cold-cast structures to meet the requirements of cost-effectiveness, eco-friendliness, and rapid construction. The study aims to explore the possibilities of design and calculation of low-rise buildings erected from lightweight thin-walled steel structures using frame construction technology. The design solutions for the roof, walls, floors, and foundation are exemplified using concrete examples. The load capacity off framing studs, roof beams, and floor slabs was calculated. Three methods were used for calculation - Eurocode 3, direct strength test, and ultimate load test in compliance with AISI standards.

scholarly journals Assessment of structural reliability of precast concrete buildings

2018 ◽  
Vol 143 ◽  
pp. 01001
Author(s):  
Alexandr Koyankin ◽  
Valeriy Mitasov
Keyword(s):  
Structural Reliability ◽  
Precast Concrete ◽  
Rapid Development ◽  
Objective Assessment ◽  
Experimental Studies ◽  
Full Scale ◽  
Building Structures ◽  
Numerical Studies ◽  
Floor Slabs ◽  
Precast Buildings

Precast housing construction is currently being under rapid development, however, reliability of building structures made from precast reinforced concrete cannot be assessed rationally due to insufficient research data on that subject. In this regard, experimental and numerical studies were conducted to assess structural reliability of precast buildings as described in the given paper. Experimental studies of full-scale and model samples were conducted; numerical studies were held based on finite element models using “Lira” software. The objects under study included fragment of flooring of a building under construction, full-size fragment of flooring, full-scale models of precast cross-beams-to-columns joints and joints between hollow-core floor slabs and precast and cast-in-place cross-beams. Conducted research enabled to perform an objective assessment of structural reliability of precast buildings.

scholarly journals Improvement of Tilting-Pad Journal Bearing Operating Characteristics by Application of Eddy Grooves

Lubricants ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 18
Author(s):  
Eckhard Schüler ◽  
Olaf Berner
Keyword(s):  
High Speed ◽  
Journal Bearing ◽  
Load Capacity ◽  
Fluid Film ◽  
Operating Characteristics ◽  
Fluid Film Bearings ◽  
Tilting Pad ◽  
Bearing Load ◽  
Bearing Loads ◽  
Tilting Pad Journal Bearing

In high speed, high load fluid-film bearings, the laminar-turbulent flow transition can lead to a considerable reduction of the maximum bearing temperatures, due to a homogenization of the fluid-film temperature in radial direction. Since this phenomenon only occurs significantly in large bearings or at very high sliding speeds, means to achieve the effect at lower speeds have been investigated in the past. This paper shows an experimental investigation of this effect and how it can be used for smaller bearings by optimized eddy grooves, machined into the bearing surface. The investigations were carried out on a Miba journal bearing test rig with Ø120 mm shaft diameter at speeds between 50 m/s–110 m/s and at specific bearing loads up to 4.0 MPa. To investigate the potential of this technology, additional temperature probes were installed at the crucial position directly in the sliding surface of an up-to-date tilting pad journal bearing. The results show that the achieved surface temperature reduction with the optimized eddy grooves is significant and represents a considerable enhancement of bearing load capacity. This increase in performance opens new options for the design of bearings and related turbomachinery applications.

scholarly journals Mitigating the Energy Consumption and the Carbon Emission in the Building Structures by Optimization of the Construction Processes

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3287
Author(s):  
Alireza Tabrizikahou ◽  
Piotr Nowotarski
Keyword(s):  
Life Cycle ◽  
Energy Consumption ◽  
Structural Optimization ◽  
Carbon Emissions ◽  
Carbon Emission ◽  
Construction Materials ◽  
High Energy ◽  
Building Structures ◽  
Life Cycle Stages ◽  
Reduction Of Energy Consumption

For decades, among other industries, the construction sector has accounted for high energy consumption and emissions. As the energy crisis and climate change have become a growing concern, mitigating energy usage is a significant issue. The operational and end of life phases are all included in the building life cycle stages. Although the operation stage accounts for more energy consumption with higher carbon emissions, the embodied stage occurs in a time-intensive manner. In this paper, an attempt has been made to review the existing methods, aiming to lower the consumption of energy and carbon emission in the construction buildings through optimizing the construction processes, especially with the lean construction approach. First, the energy consumption and emissions for primary construction materials and processes are introduced. It is followed by a review of the structural optimization and lean techniques that seek to improve the construction processes. Then, the influence of these methods on the reduction of energy consumption is discussed. Based on these methods, a general algorithm is proposed with the purpose of improving the construction processes’ performance. It includes structural optimization and lean and life cycle assessments, which are expected to influence the possible reduction of energy consumption and carbon emissions during the execution of construction works.

High-speed railway and tourism development in China

2021 ◽  
pp. 135481662199852
Author(s):  
Shujie Yao ◽  
Xu Yan ◽  
Chun Kwok Lei ◽  
Feng Wang
Keyword(s):  
High Speed ◽  
Tourism Development ◽  
Policy Implications ◽  
Control Group ◽  
Difference In Differences ◽  
Transportation Mode ◽  
High Speed Railway ◽  
Model Cities ◽  
Large Panel ◽  
Research Findings

High-speed railway (HSR) is a new and increasingly popular transportation mode in China bringing about a significant impact on the economy, including tourism development. This article investigates the effect of HSR on tourism development in China based on a time-varying difference-in-differences model. Cities connected by HSR in 2013 and 2014 are regarded as the treatment group, while those without HSR services until 2017 are placed in the control group. The empirical analyses cover a large panel dataset comprising 163 cities in 2009–2017. The empirical results suggest that both domestic tourism revenue and tourist number are positively affected by HSR, and the effect is stronger for the undeveloped or geopolitically less important regions such as the inland or prefecture-level cities. Other relevant determinants of tourism include the availability of airports and the number of hotels in the cities. Our research findings have important policy implications for tourism development in China with respect to HSR.

Key Technique on the Process Control for Construction of Hohhot Circle Expressway Asphalt Pavements

2012 ◽  
Vol 256-259 ◽  
pp. 1748-1753
Author(s):  
Bin Zhao ◽  
Pei Wen Hao
Keyword(s):  
Inner Mongolia ◽  
Raw Materials ◽  
Asphalt Pavement ◽  
Load Capacity ◽  
Asphalt Mixture ◽  
Natural Increase ◽  
Rigid Base ◽  
Construction Technology ◽  
Pavement Structure ◽  
Major Section

As vehicle flow on arterial highway in Inner Mongolia sharply increased, the originally designed natural increase rate of 8% per year has been exceeded on the vehicle flow in some sections. According to statistics, monthly average vehicle flow on major section of G6 expressway has reached a standard flow of 67478 vehicles per day and night, of which in 70-80% are large ones for coal transportation. Therefore, pavement load and road capacity have exceed the designed expressway load capacity. At present, semi-rigid base asphalt pavement structure is still widely used for high-grade highway pavement in Inner Mongolia. With years of construction for such pavement structure, a great deal of valuable experience has been gained on construction technology. However, there are still a few deficiencies in the quality of raw materials, gradation control of asphalt mixture and adjustment of equipment, etc. Hohhot circle expressway connects with the G6 and G7 expressways, suffering from problems such as large vehicle flow and load overweight. This paper introduced a key technique that should be properly controlled during construction of such pavement structure, emphasized technique control and management of the following aspects, i.e. ballast sizes and gradation control, asphalt concrete mixture, adjustment of pavers, validation of mixing proportion in production and reasonable arrangement of process, and summarized corresponding technical measures taken during construction of asphalt pavement in this project.

Numerical and experimental studies on the thermal and static characteristics of multi-leaf foil thrust bearing

2021 ◽  
pp. 135065012110110
Author(s):  
Yu Guo ◽  
Yu Hou ◽  
Qi Zhao ◽  
Xionghao Ren ◽  
Shuangtao Chen ◽  
...  
Keyword(s):  
High Speed ◽  
Thrust Bearing ◽  
Load Capacity ◽  
Failure Process ◽  
Experimental Studies ◽  
Elastic Model ◽  
Static Characteristics ◽  
Bearing Load ◽  
Foil Thrust Bearing ◽  
Cooling Air

Foil bearing is considered to be a promising supporting technology in high-speed centrifugal machinery. Due to the high-speed shearing effect in the viscous lubricant film, heat generation could not be ignored. In this paper, a thermo-elastic model of the multi-leaf foil thrust bearing is proposed to predict its thermal and static characteristics. In the model, modified Reynolds equation, energy equation, and Kirchhoff equation are solved in a coupling way. The contact area between the foil and welding plate is taken into account. Besides, the effect of cooling air on the bearing temperature is investigated. The ultimate load capacity and transient overload failure process of the bearing is analyzed and discussed. The effect of rotation speed on the bearing temperature is more obvious than that of the bearing load. The bearing temperature drops obviously by introducing the cooling air, and the cooling effect is improved with the supply pressure. The transient overload failure of the bearing occurs when the bearing load exceeds the ultimate value.

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